diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 3fa2b0245..9b301fff0 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="2.8+dfsg-4"
-export PIKA_PACKAGE_NAME="gsl"
+export PIKA_PACKAGE_VERSION="0.12.3-1"
+export PIKA_PACKAGE_NAME="rust-pretty"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"